/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.commons.client;

import org.apache.commons.pool2.KeyedObjectPool;
import org.apache.iotdb.commons.client.exception.ClientManagerException;
import org.apache.iotdb.commons.utils.TestOnly;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Optional;

public class ClientManager<K, V> implements IClientManager<K, V> {

    private static final Logger logger = LoggerFactory.getLogger(ClientManager.class);

    private final KeyedObjectPool<K, V> pool;

    ClientManager(IClientPoolFactory<K, V> factory) {
        pool = factory.createClientPool(this);
    }

    @TestOnly
    public KeyedObjectPool<K, V> getPool() {
        return pool;
    }

    @Override
    public V borrowClient(K node) throws ClientManagerException {
        try {
            return pool.borrowObject(node);
        } catch (Exception e) {
            throw new ClientManagerException(e);
        }
    }

    /**
     * return a client V for node K to the ClientManager Note: We do not define this interface in
     * IClientManager to make you aware that the return of a client is automatic whenever a particular
     * client is used.
     */
    public void returnClient(K node, V client) {
        Optional.ofNullable(node)
                .ifPresent(
                        x -> {
                            try {
                                pool.returnObject(node, client);
                            } catch (Exception e) {
                                logger.error(
                                        String.format("Return client %s for node %s to pool failed.", client, node), e);
                            }
                        });
    }

    @Override
    public void clear(K node) {
        Optional.ofNullable(node)
                .ifPresent(
                        x -> {
                            try {
                                pool.clear(node);
                            } catch (Exception e) {
                                logger.error(
                                        String.format("Clear all client in pool for node %s failed.", node), e);
                            }
                        });
    }

    @Override
    public void close() {
        try {
            pool.close();
        } catch (Exception e) {
            logger.error("Close client pool failed", e);
        }
    }
}
